Si_3N_4-TiZrN_2-TiN复合导电陶瓷  

Si_3N_4-TiZrN_2-TiN Conductive Ceramic Composite

作　　者：江涌[1] 黄新华[1] 吴澜尔[1] 陆有军[1] JIANG Yong;HUANG Xinhua;WU Lan’er;LU Youjun(Beifang University of Nationalities,Yinchuan 750021,Ningxia,China)

机构地区：[1]北方民族大学,宁夏银川750021

出　　处：《陶瓷学报》2018年第3期293-297,共5页Journal of Ceramics

基　　金：宁夏高校重点项目(NGY2013088;2015158);国家自然科学基金(51362001)

摘　　要：以制备可用电火花加工的氮化硅基陶瓷材料为目的,用Zr N-Ti N作为导电相,以Y_2O_3、La_2O_3、Al N作为烧结助剂,在1750℃无压烧结Si_3N_4-Ti Zr N_2-Ti N复合导电陶瓷。测试了试样的烧结特性、机械性能及导电性能,用XRD和SEM分析表征了试样的物相和显微结构。其结果为:相对密度接近98%;试样的机械性能良好,抗弯强度可达到960 MPa,显微硬度为14.7 GPa,断裂韧性为7.6 MPa·m^(1/2);试样的电阻率由单相氮化硅陶瓷的10^(13)?·cm降低到复合导电陶瓷的10^(-2)?·cm数量级,可用电火花进行加工。物相分析表明,试样中生成了Ti Zr N_2新物相,形成了Si_3N_4-Ti Zr N_2-Ti N复合导电陶瓷。显微分析表明,试样中的三种晶粒均在2μm以下,具有相互结合紧密且分布较均匀的显微结构。Si3N4-TiZrN2-TiN electric ceramic composite was prepared by pressless sintering at 1750 ℃ with Y2O3, La2O3 and AlN as sintering additives and ZrN-TiN as electric phases. The sintering behavior, mechanical and electric properties of the composite were tested. The phase composition and microstructure of the composite were analyzed by XRD and SEM. The result shows that its relative density reaches 98%, its bending strength 960 MPa, its Vickers hardness 14.7 GPa, and its fracture toughness 7.6 MPa·m^1/2. The electric resistivity of the samples decreases to as low as 10^-2 Ω·cm from 10^13 Ω·cm of single phase Si3N4. It makes electrical discharge machining of the composite possible. Phase composition analysis result shows a new phase of TiZrN2 is formed in the samples and Si3N4-TiZrN2-TiN composite conductive ceramic is produced. The grains are less than 2 μm, and the samples have a microstructure in which the TiZrN2, TiN and Si3N4 grains are closely bonded to each other and uniformly distributed.

关 键 词：Si3N4-TiZrN2-TiN 复合导电陶瓷 导电相 电阻率 

分 类 号：TQ174.75[化学工程—陶瓷工业]